Alex Hyde / Cirrus uncinus or Mares' Tails cloud formations, Isle of Mull, UK.
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Peter Cairns / Reflections over Masvatn lake in winter, Iceland, September 2013.
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Peter Cairns / Snow Geese (Chen caerulescens) taking off en-masse in evening light, Bosque del Apache, New Mexico, USA, December.
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Peter Cairns / RF- Sandhill Cranes (Grus canadensid) roosting at dusk, Bosque del Apache, New Mexico, USA, December. (This image may be licensed either as rights managed or royalty free.)
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Peter Cairns / Tussocks of grass in wetland habitat in early winter, Bosque del Apache, New Mexico, USA, December 2012.
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Sergey Gorshkov / Black and white photograph of Snow geese (Chen caerulescens) Wrangel Island, Far Eastern Russia, May.
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Peter Lewis / Cumulus and Cirrus Cloud formation New Forest, Hampshire, England, UK.
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Yva Momatiuk & John Eastcott / Cirrus and cumulus clouds over desert, Uluru-kata Tjuta National Park, Northern Territory, Australia
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Yva Momatiuk & John Eastcott / Cirrus clouds above desert, Uluru-kata Tjuta National Park, Northern Territory, Australia
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Yva Momatiuk & John Eastcott / Desert flowers and cirrus clouds, Uluru-kata Tjuta National Park, Northern Territory, Australia
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Yva Momatiuk & John Eastcott / Gum Tree (Eucalyptus sp) group and cirrus clouds, Nullarbor Plain, Western Australia, Australia
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Aflo / Y-12204 Cloud formations in sky over Vermillion Lake, Canada